<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>练习2：用DOM操纵图片</title>
		<style type="text/css">
			html,div,ul,li {margin: 0px;padding: 0px;}
			a{cursor: pointer;}
			li {list-style: none;cursor: pointer;}
			fieldset {border: #000 1px dashed;width: 225px;height: 225px;padding: 10px;text-align: center;float: left;margin-left: 5px;}
			#cont_left {width: 300px;height: 500px;float: left;}
			#cont_right {float: left;}
			.newcss1{background-color: yellowgreen;}
		</style>
	</head>
	<body>
		<div id="cont_left">
			<ul><img src="img/fold.gif"><a onclick="show('menu1')"> 通过DOM获取信息 </a>
				<ul id="menu1">
					<li onclick="showImg()"><img src="img/doc.gif">获取原始图片路径</li>
					<li onclick="getFruit()"><img src="img/doc.gif">获取我喜欢的水果</li>
				</ul>
			</ul>
 
			<ul><img src="img/fold.gif"><a onclick="show('menu2')"> 通过DOM操作元素 </a>
				<ul id="menu2">
					<li onclick="createImg()"><img src="img/doc.gif">创建图片</li>
					<li onclick="cloneImg()"><img src="img/doc.gif">克隆图片</li>
					<li onclick="changeImg()"><img src="img/doc.gif">改变图片</li>
					<li onclick="removeImg()"><img src="img/doc.gif">删除图片</li>
				</ul>
			</ul>
 
			<ul><img src="img/fold.gif"><a onclick="show('menu3')"> 通过DOM操作样式 </a>
				<ul id="menu3">
					<li onclick="changeCss1()"><img src="img/doc.gif">为原始图片加上行间样式</li>
					<li onclick="changeCss2()"><img src="img/doc.gif">为所有的fieldset加上内部样式</li>
				</ul>
			</ul>
 
		</div>
		<fieldset>
			<legend>原始图片</legend>
			<img id="fruit" src="img/fruit.jpg">
		</fieldset>
		<fieldset>
			<legend>图片路径</legend>
			<p id="msg1">在这里显示</p>
		</fieldset>
		<fieldset>
			<legend>选择你喜欢的水果</legend>
			<ul style="text-align: left;">
				<li>
					<input name="enjoy" type="checkbox" value="苹果" />苹果
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="香蕉" checked="checked" />香蕉
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="葡萄" />葡萄
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="梨" checked="checked" />梨
				</li>
				<li>
					<input name="enjoy" type="checkbox" value="西瓜" />西瓜
				</li>
			</ul>
			<div id="msg2" style="margin-top: 10px;text-align: left;"></div>
		</fieldset>
		<fieldset>
			<legend>创建图片</legend>
			<div id="msg3"></div>
		</fieldset>
		<fieldset>
			<legend>克隆图片</legend>
			<div id="msg4"></div>
		</fieldset>
		<script>
		
					//菜单收缩与扩展
					function show(title) {
						let currentMenu = document.getElementById(title);
						let currentStatus = currentMenu.style.display;
						currentMenu.style.display = currentStatus == "" ? "none" : "";
					}
					//获取原始图片路径
					function showImg() {
						let img=document.getElementById("fruit");
						let msg1=document.getElementById("msg1");
							msg1.innerHTML=img.getAttribute("src");
					}
					//获取喜欢的水果
					function getFruit() {
						let enjoys=document.getElementsByName('enjoy');
						enjoys[4].checked=true;
						 xuanze.innerHTML=enjoys[4].value;
					}
					//创建图片
					function createImg() {
						//let msg3=document.getElementById("msg3");
						  var bigImg=document.createElement("img");
						  bigImg.src="img/grape.jpg"
						  var  msg3=document.getElementById('msg3');
						   msg3.appendChild(bigImg);
					}
					//克隆图片
					function cloneImg() {
						var bigImg=document.createElement("img");
						bigImg.src="img/grape.jpg"
						var  msg4=document.getElementById('msg4');
						 msg4.appendChild(bigImg);
					}
					//改变图片
					function changeImg() {
						let img=document.getElementById("fruit");
							 let enjoys=document.getElementsByName('fruit');
							fruit.src="img/grape.jpg"
							 
					}
					//删除图片
					function removeImg() {
						let img=document.getElementById("fruit");
						img.remove()
						document.body.removeChild(img);
					}
					//操作样式1
					function changeCss1(){
						let img=document.getElementById("fruit");
						fruit.style.border="10px solid red";
					}
					//操作样式2
					function changeCss2(){
						//fieldset
						var x=document.querySelectorAll("fieldset") ;
						var i;
						for (i = 0; i < x.length; i++) {
						    x[i].style.backgroundColor = "green";
						}
					}
		
		</script>
	</body>
</html>

